[RFC 1/4] iwlwifi: dump stack when fail to gain access to the device

[Stanislaw Gruszka <sgruszka@redhat.com>]

Print dump stack when the device is not responding. This should give
some more clue about the reason of failure. Also change the message we
print, since "MAC in deep sleep" is kinda confusing.

On the way add unlikely(), as fail to gain NIC access is hmm ...
unlikely.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
---
 drivers/net/wireless/iwlwifi/iwl-io.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/iwlwifi/iwl-io.c b/drivers/net/wireless/iwlwifi/iwl-io.c
index 83fdff3..ce6d9c1 100644
--- a/drivers/net/wireless/iwlwifi/iwl-io.c
+++ b/drivers/net/wireless/iwlwifi/iwl-io.c
@@ -120,10 +120,10 @@ int iwl_grab_nic_access_silent(struct iwl_bus *bus)
 int iwl_grab_nic_access(struct iwl_bus *bus)
 {
 	int ret = iwl_grab_nic_access_silent(bus);
-	if (ret) {
+	if (unlikely(ret)) {
 		u32 val = iwl_read32(bus, CSR_GP_CNTRL);
-		IWL_ERR(bus,
-			"MAC is in deep sleep!. CSR_GP_CNTRL = 0x%08X\n", val);
+		WARN_ONCE(1, "Timeout waiting for ucode processor access "
+			     "(CSR_GP_CNTRL 0x%08x)\n", val);
 	}
 
 	return ret;
-- 
1.7.1